Hydrating lime.



P. e. TOEPFER. HYDRATING LIME.

APPLICATION FlLE'D AUG.21, 1913.

Patented July 13, 1915.

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. 1 N N m P a COLUMBIA PLANOGRM'H co, WASHINGTON, n. c.

PETER G. TOEPFER, 0F MILWAUKEE, WISCONSIN.

HYDRATING- LIME.

Application filed August 21, 1913.

To all whom it may concern: 7

Be it known that I, PETER G. Tonrrnu, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of lVisconsin, have invented certain new and useful Improvements in Hydrating Lime; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention consists in what is herein particularly set forth with reference to the accompanying drawing and pointed out in the claims of this specification, its object being an economic production of high grade dry powdered hydrate of lime from lump lime as it comes fromthe kiln, theproduct being free from unburned or overburned particles of carbonate of lime, stones or other impurities, and also to save the hydrated lime that would otherwise escape into atmosphere with vapor that results from a slaking of quicklime with water as a step in the method to which said invention relates. 1

The drawing is a diagram of apparatus in accordance with my invention for carrying out the herein disclosed method of economic production of dry powdered and automatically purified hydrate of lime with a saving of particles of the product that would otherwise escape with vapor into atmosphere.

Referring by numerals to the drawing, 1 indicates a housing of any suitable materials and construction, and 2 sills for the housing. Within a lower chamber of the housing is a solid wall cylinder 3 fastened to spiders 4: that are fast upon a driven-shaft 5 in gear with a main drive-shaft 6 that is also geared to the shafts 7 and 8 respectively of upper and lower horizontally disposed spiral conveyers 9 and 10 within said housing. The cylinder and its shaft are inclined and the upper open end of said cylinder turns in a circular end flange 11 of a chute 12 that is open to an upper chamber of the housing in which the conveyor 9 is arranged. The housing is provided with a lid 13 that closes the opening in the chute through which quicklime is fed to discharge into the cylinder, the lower end of said cylinder being normally closed by a head 14 that has a central outer boss in slip-fit on the shaft 5 and shackle-connection with an adjusting screw 15, which screw extends outside of said cylinder where it is provided with a handwheel Specification of Letters Patent.

Patented July 13, 1915.

Serial No. 785,829.

16 or other suitable device to facilitate its manipulation. By means of the screw, the head l l is adjusted to open the lower end of the cylinder more or less as may be required. Water is introduced into said cylinder through a valve-controlled pipe 16 from a suitably arranged tank 17', herein shown as provided with a gage 18 to determine the amount of water to be discharged therefrom inproportion to charge of quicklime fed to the aforesaid cylinder.

Pivotally suspended from the top of the upper chamber of the housing are screens 19 the frames of which are provided with ears 20 attached to a connecting bar 21., and suspended in rigid connection with the bar are other screens 22 that depend below those aforesaid with which they alternate. ()ne end of the bar is coupled by a spring 23 with a bracket 24 of the housing, and extending from the other end of said bar through said housing is a flexible pull device trained on a suitably arranged pulley 26. Opposing the lower end of each screenframe are stops 27, and the screen-material in the frames is preferably wire netting of suitable mesh. Leading lnto atmosphere from the top of the upper chamber of the housing, adjacent to that end of said chamber farthest from the quicklime chute 19., is a draft-flue 28, and leading from the conveyer 9 to the conveyor 10 is a spout 29. Adjacent to the discharge end of the conveyer 10, the bottom of the housing is perforated at 30 over the flaring upper end of a delivery spout 31 to form a separating screen.

In practice, the cylinder-head 14 being in normal position, the cylinder 3 is charged with quicklime and water in suitable proportions and motion imparted to the rotary parts of the apparatus. Lime-laden vapor from the cylinder passes up through the chute 12 and through the screens 19 and 22 in the upper chamber of the housing on its way to atmosphere through the flue 28, the result being a deposit of particles of hydrated lime upon said screens. From time to time, a pull is exerted upon the bar 2-1 against resistance of the spring 23, and said bar being permitted to have sudden return to normal position there is a knock of the screens aforesaid against the stops 27 to dislodge adhering particles of hydrated lime that fall into the conveyor 9 to be fed by the same into the spout 29 through which they fall into the conveyer 10. Suli'icient time having elapsed for the slaking of some of the quicklime in the rotating cylinder, the cylinder-head 14: is adjusted to permit a flow of slaked product in the form of a heavy liquid to the conveyer 10, coarse impurities remaining in said cylinder serving, by attrition, to break up the lime and thus facilitate the hydration thereof. To get rid of coarse impurities accumulating in the hydrating cylinder, a receptacle is set in (through a convenient manhole) under the lower end of said cylinder and the cylinderhead 14 run back a sufficient distance to clear said impurities, that then fall into said receptacle for removal therewith. The release of the slaked product is recurrent at suitable intervals.

All of the hydrated lime deposited in the conveyer is dried out and in powder form by the time it reaches the perforated bottom portion of the housing through which the finished product is separated, by gravity, from unburned or overburned particles of carbonate of lime, stones or other impurities that are discharged as tailings at the forward end of said conveyer.

It will be observed that conveyer 10 ex tends the full longitudinal length of the base of the housing 1, and that said conveyer receives the product from cylinder 3 at one end and conducts such product practically its entire length before discharging into screen 30. This manner of handling the product is advantageous in that during lump as it comes from the kiln, my apparatus being such that no'reduction of said lime is necessary prior to feeding the same to the hydrating cylinder, whereby a saving in time and expense results.

I claim:

1. A method of producing hydrated lime which consists in treating a mass of quicklime with water in an inclined revolving cylinder, intermittently effecting gravity release of the slaked lime, thereafter drying the product by exposing the same to the atmosphere, and gravity screening said procluct after being dried.

2. A method of producing hydrated lime which consists in treating a mass of quicklime with water in an inclined revolving vessel, efiecting the precipitation of lime powder from resulting lime-laden vapor, intermittently effecting gravity release of the slaked product, thereafter drying the product by exposing the same to the atmosphere, and finally screening said product.

3. A method of producing hydrated lime which consists in treating a mass of quick lime with water while confined in an inclined revolving receptacle, effecting the release of the slaked product, conducting the released product to a screen, and exposing the product to the drying influence of the atmosphere while being conducted to the screen.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee in the county of Milwaukee and State of lVisconsin in the presence of two witnesses.

PETER G. TOEPFER.

Witnesses N. E. OLIPHANT, M. E. DOWNEY.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents,

Washington, D. C. 

